String Palindrome Verification

Given a string, your task is to determine if it is a palindrome considering only alphanumeric characters.

Input:

The input is a single string without any leading or trailing spaces. All characters are in lowercase.

Output:

The output should be a single line printing 'true' if the string is a palindrome, otherwise 'false'.

Example:

Input: "malayalam"
Output: true
Explanation: The string "malayalam" reads the same forward and backward, hence it is a palindrome.

Constraints:

• 0 <= N <= 10^6
• N is the length of the input string.
• Time Limit: 1 second

Note:

Your implementation should return a boolean value. Printing is handled internally.